Title :
A low-power ASIC implementation of 2Mbps antenna-rake combiner for WCDMA with MRC and LMS capabilities
Author :
Tarighat, Alireza ; Grayver, Eugene ; Eltawil, Ahmed ; Frigon, Jean-Francois ; Poberezhskiy, Gennadiy ; Zou, Hanli ; Daneshrad, B.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
An ASIC implementation of a WCDMA mobile terminal with 2-dimensional adaptive antenna-rake combining is presented in this paper. System analysis shows that adaptive antenna-rake combining techniques can significantly enhance the performance and capacity of cellular systems compared to conventional CDMA systems. A hardware efficient receiver architecture is implemented supporting both maximal ratio combining (MRC) and least mean squares (LMS) algorithm. Moreover, the proposed architectures allows for a dynamic and flexible allocation of available processing resources (total of 20 fingers) to different antennas and multipaths based on the instantaneous channel profile. The presented receiver can operate in both normal and space time transmit diversity (STTD) modes. The system was implemented in a 0.18μm CMOS process and the improvement was validated through real-time field trials.
Keywords :
3G mobile communication; CMOS integrated circuits; antennas; application specific integrated circuits; cellular radio; code division multiple access; least mean squares methods; low-power electronics; radio receivers; 0.18 micron; 2 Mbit/s; ASIC implementation; CMOS process; LMS capability; MRC capabiltiy; WCDMA mobile terminal; adaptive antenna-rake combining techniques; antenna-rake combiner; cellular systems; least mean squares algorithm; maximal ratio combing; receiver architecture; space time transmit diversity modes; Adaptive arrays; Application specific integrated circuits; Diversity reception; Hardware; Least squares approximation; Mobile antennas; Multiaccess communication; Performance analysis; RAKE receivers; Resource management;
Conference_Titel :
Custom Integrated Circuits Conference, 2005. Proceedings of the IEEE 2005
Print_ISBN :
0-7803-9023-7
DOI :
10.1109/CICC.2005.1568610
